单项选择题

It can be concluded from this article that the attractive force of the sun on the Earth's oceans is about ______.

A．half that of the moon
B．equal to more than half that of the moon
C．equal to that of the moon
D．twice that of the moon
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单项选择题
The principal idea of this article is ______.
A．the attraction of the sun and the moon
B．the sun, the moon and the wind
C．the changing tides
D．the factors affecting the tides
单项选择题
According to the passage, it is clear that the force of the moon ______.
A．is not as important as that of the wind
B．is less than half that of the sun
C．is the primary cause of the alternate rise and fall of the surface of the seas
D．does not influence the rise and fall of the surface of the seas
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